Insufficient randomness in generation of DNS query IDs in c-ares
CVE-2023-31147

5.9MEDIUM

Key Information:

Vendor

C-ares

Status
C-ares
Vendor
CVE Published:
25 May 2023

What is CVE-2023-31147?

c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.

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Affected Version(s)

c-ares < 1.19.1

References

https://github.com/c-ares/c-ares/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-ann...

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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